Glossary 15
program an d leave the TSR program resi-
dent in memory for later use.
TSR programs can sometime s caus e
memory conflicts. When troubleshooting,
rule out th e possibility of such a conflict
by rebooting your computer without start-
ing any TSR programs.
Abbreviation for Underwriters
Laboratories.
Abbreviation for upper memory blocks.
The 384 KB of RAM located between
640 KB and 1 MB. If the computer has an
Intel386 or higher processor, a utility
call ed a

memory manag er

can create
UMBs in the upper memory area, in which
you can loa d de vi ce d r iv ers and memo ry-
resident programs.
Abbreviation for uninterruptible power
supply . A battery -po we red u nit th at auto-
matica lly supp li es pow er to your
computer in the event of an electrical
failure.
Abbreviation for Universal Serial Bus. A
USB conn ector pro vides a si ngl e conn ec-
tion point for multiple USB-compliant
devices, such as mice, keyboards, print-
ers, and computer speakers. USB devices
can als o be co nnected a nd discon nected
while the system is running.
A program used to manage system re-
sources—memory, disk drives, or
printers, for example.
Abbreviation for unshielded twisted pair.
Abbreviation for volt(s).
Abbreviation for volt(s) alternating
current.
Abbreviation for Voluntary Control Council
for Interference.
Abbreviation for video ca ssette rec orde r.
Abbreviation for vol t(s) direct cu rrent.
Acronym for Video Electronics Standards
Association.
Abbreviation for video graphics array. VGA
and SVGA are video standards for video
adapters with greater resolution and color
display capabili ties than pr evious
standards.
To display a program at a specific resolu-
tion, you must install the appropriate
video drivers an d you r monitor mu st sup-
port the resolution. Simi larly, the numbe r
of colors that a program can display de-
pends on the c apab ili ties of the moni tor,
the video driver, and the amoun t of video
memory installed for the video adapter.
On some systems with a built-in VGA
video adapter, a VGA feature connector
allows you to add an enhancement adapt-
er, such as a video accelerat or, to your
computer. A VGA feature connector can
also be called a

VGA pass-through

connector

.
The logical circuitry that provides—in
combination with the monitor—your com-
puter’s video capabilities. A video adapter
may support more or fewer features than
a specific monitor offers. Typically, a video
adapter comes with video drivers for dis-
playing popul ar appli cation p rogram s and